Fix dragging panels changing region size

While dragging panels, the region size would change which would feel glitchy.

See D7462 for a demo of the issue.

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/editors/interface/interface_panel.c b/source/blender/editors/interface/interface_panel.c
index f824670cc57..911250891f0 100644
--- a/source/blender/editors/interface/interface_panel.c
+++ b/source/blender/editors/interface/interface_panel.c
@@ -876,6 +876,16 @@ static int get_panel_real_ofsx(Panel *panel)
   }
 }
 
+bool UI_panel_is_dragging(const struct Panel *panel)
+{
+  uiHandlePanelData *data = panel->activedata;
+  if (!data) {
+    return false;
+  }
+
+  return (data->state == PANEL_STATE_DRAG);
+}
+
 typedef struct PanelSort {
   Panel *panel, *orig;
 } PanelSort;